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. 2008 Apr 4;38(4):372–389. doi: 10.1007/s10519-008-9201-8

Table 6.

Number of sib pairs required to detect G × E interaction effects in eight different conditions (see Fig. 1) for power of .80 with α = .05a

Environment
b 1 = .2 b 1 = .5 Continuous
p = .2 p = .5 p = .2 p = .5 p = .2 p  = .5
Design(i) 410 261 263 169 289 185
Design(i = c) 144 175 93 113 102 124
Design(i,e); Design(i,a); Design(i,a,d); Design(i,a,e); Design(−i,a); Design(−i,a,e) 410 261 263 169 289 185

aAll tests assume two degrees of freedom